// this goes in your header (.h) file
class Example {
public:
	void print_thing(int);
};
// end header file


// from here on is the .cpp file
#include <iostream>

void Example::print_thing(int x) {
	std::cout << "Your integer is " << x << std::endl;
}

int main() {
	Example e;
	e.print_thing(5);
}